I have been drawing since i was a child and from my experience my art work gets better with age and my best pieces tend to come from my imagination rather than copying existing art. One thing i enjoy drawing A LOT is HORROR, DEMONS, MONSTERS etc. What i normally ask friends/Clients is describe whatever it is that is in their mind and i will form whatever i can see in my head on to paper.
Please see my examples to get an idea of my style